i have a 99 sc with a 4.2 auto. most of the time it shifts fine and then sometimes its not shifting fine. it will late shift and hard shift at times. every once in a while it will act like it slips when its going from 2nd to 3rd. it might do that 2 or 3 times a day then sometimes it doesnt do it at all for days. fluid smells fine and doesnt look burnt. im stumped. thanks for the advice in advance